Igniter for gas or gasolene engines.



No. 771,631. PATENTED 001?. 4, 1904.

- P. P. G. HALL, JR.

IGNITER FOR GAS OR GASOLENE ENGINES.

APPLICATION 11.21) nov.19,19o2.

110 MODEL.

UNITED STATES Patented October 4, 1904.

PATENT OFFICE.

IGNITER FOR GAS OR GASOLENE ENGINES.

SPECIFICATION forming part of Letters Patent No. 771,631, dated October 4, 1904-.

Application filed November 19, I902. Serial No. 181,921. (No model.)

To all whom it may concern.-

Be it known that 1, PETER P. G. HALL, Jr., a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Igniters for Gas or Gasolene Engines, of which the following is a specification.

My invention consists of an improvement in gas or gasolene engines wherein I provide means for preventing the burning gases in the cylinder and the lubricating-oil from reaching the insulation.

It further consists in providing for the radiation of heat to prevent the burning out of the insulation.

It further consists in novel details of construction, all of which will be hereinafter set forth.

The figure represents a sectional view of a portion of a cylinder with the igniter therefor, showing the insulation therein.

Referring to the drawing, A designates the upper portion of a cylinder of a gas-engine in which is suitably supported the igniting apparatus therefor, said cylinder being suitably connected with the ground and has the contact-piece B suitably supported and movable therein. Screwed-or otherwise secured in the cylinder is the plug 0, the same having a well or bore D therethrough, and the lower Walls of said plug project some distance within the cylinder, as at E, forming a protector for the igniter-pin, as will be hereinafter explained. Projecting from the plug G is a flange F, upon which is adapted to rest the plate G, which in the present instance has the flange H screwed to the flange F, it being seen that the two portions form the air-chamber J.

K designates a suitable insulation, such as mica, secured to the plate G, the same being mounted upon the sleeve L, which has the head M thereon, between which latter and the nut N'the mica is held in place, the said nut N being adjustable on the sleeve L.

P designates a firing-pin which is adjustably connected with the sleeve L and passes down through the well D and projects slightly below the lower portion of the plug (1. Suitable binding-nuts Q are carried on said firingpin, which is also provided with the head R, it being noticed that the binding-nuts are adapted to engage with a suitable conductor leading to a suitable battery and necessary parts to form a circuit.

V The operation will be readily understood. The spark being formed when the contact B is separated from the firing-pin P, it is seen by the construction that the insulation being situated at such a distance from the cylinder and that the portion of the insulation which is within the plug is protected by the head M. forming a shield from contact with the burned products in the engine-cylinder and also the oil used to lubricate. In addition, by reason of the air-chamber J and the' well D an aircushion is formed which will assist in preventing the burned produet and the lubricating-oil from reaching the insulation, since it will be apparent that the air in the well D and chamber J will be compressed to only a certain extent, and thus prevent access to the chamber, so that the insulation is kept perfectly clean and bright, thereby maintaining the electrical resistance of the same. Furthermore, the plug allows for radiation of heat, which also prevents the insulation from burning out. In addition the difference in temperature between the insulated portion and the grounded portion does not permit of suflicient dilference in expansion to loosen the insulation, and itwill be further seen that the lower portion of the Well or plug forms a protector or petticoat around the point of the fir- .ing or igniting pin, thus preventing the dripping of oil from the cylinder-head upon the igniter-contacts. The maintaining of the resistance of the insulation allows a much smaller battery-power to be used and a shorter time of contact in the cylinder, thereby increasing the economy of the battery.

It will be evident that various changes may be made by those skilled in the art which will come within the scope of my invention, and I do not, therefore, desire to be limited in every instance to the exact construction herein shown and described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. An igniting device comprising a tubular plug adapted to enter the wall of an enginecylinder and formed with an enlarged chamber communicating with its bore exterior of such cylinder, a firing-pin passing through said plug, its uncovered inner portion being spaced away from the walls of such bore, a body of insulating material interposed between a portion of said pin and the wall of said chamber and a shield on said pin in said chamberand between said insulating-body and the end of such bore.

2. An igniting device comprising atubular plug adapted to enter the wall of an enginecylinder and formed with an enlarged chamber communicating with its bore and exterior of such cylinder, a firing-pin passing through said plug, its uncovered inner portion being spaced away from the walls of such bore, a body of insulating material interposed between a portion of said pin and the wall of said chamber and a shield on said pin in said chamber and between said insulating-body and the end of such bore, said shield being of greater diameter than said bore.

3. A sparking plug for a combustion-engine containing a chamber, a communicating passage between said chamber and the interior of the engine of smaller diameter than the chamber, an electrode arranged to extend through the chamber and through the passage and to terminate near the extremity of said passage, said electrode having insulation extending within said chamber and asecond electrode arranged in proximity to the first.

PETER P. G. HALL, JR.

WVitnesses:

J 01m A. WIEDERSHEIM, C. D. MCVAY. 

